Fig. 3. Redundancy of the QA motif in larval limb repression. Ventral/lateral views of T2-A2 of first larval stage cuticles with KOs shown in insets (5x, lightened, T3 and A1 only). (A) Ubx⁺/Ubx⁺, (B) Ubx^QA/Ubx^QA, (C) Ubx^QA/Ubx^–, (D) Ubx^QA/Ubx^– adb-A^–, (E) Ubx^–/Ubx^–, (F) Ubx^– abd-A^–/Ubx^– adb-A^–. Each thoracic segment has two three-bristle KOs. Ubx⁺/Ubx⁺ (A), Ubx^QA/Ubx^QA (B), Ubx^–/Ubx⁺ (not shown) and Ubx^– abd-A^–/Ubx⁺ abd-A⁺ (not shown) larvae never had ectopic A1 KOs. Ubx^QA/Ubx^– (C) larvae had up to two-bristle ectopic A1 KOs. Ubx^QA/Ubx^– adb-A^– (D) larvae had up to three-bristle ectopic A1 KOs. Ubx^–/Ubx^– (E) larvae generally had two-bristle ectopic A1 KOs but occasionally had one-bristle KOs. Ubx^– abd-A^–/Ubx^– adb-A^– (F) larvae had full three-bristle ectopic KOs on A1 through A7. Ubx⁺/Ubx⁺ larvae (A) have thin, narrow thoracic ventral denticle belts. The A2-A7 denticle belts are broad and trapezoidal, while A1 denticles belts are somewhat less broad and trapezoidal. Ubx^QA/Ubx^QA (B), Ubx^–/Ubx⁺ (not shown), Ubx^– abd-A^–/Ubx⁺ abd-A⁺ (not shown) larvae had mild transformations of the A1 denticle belts towards an intermediate T3/A1 identity. Ubx^QA/Ubx^– (C) and Ubx^QA/Ubx^– adb-A^– (D) larvae had more severe transformations of the A1 denticle belts to intermediate T3/A1 identity. Ubx^–/Ubx^– (E) larvae had complete transformations of the A1 denticle belts to T2 identity. Ubx^– abd-A^–/Ubx^– adb-A^– (F) larvae had complete transformations of the A1-A7 denticle belts to T2 identity. Anterior is leftwards.